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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Details 4) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations $ 52,604 $ (6,868)
Net cash provided by discontinued operations 1,123 1,990
Net cash provided by (used in) operating activities 53,727 (4,878)
Cash flows from investing activities:    
Capital expenditures (227,854) (104,302)
Proceeds from sale of property, plant and equipment 26,033 30,633
Increase in restricted cash (162) 184
Return of investments in non-consolidated affiliates 42,291  
Cash invested in non-consolidated affiliates (224)  
Net cash used in continuing operations (159,916) (73,485)
Net cash used in discontinued operations (973) (1,269)
Net cash used in investing activities (160,889) (74,754)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 1,179,000 1,003,409
Repayments of long-term debt (1,158,104) (1,205,258)
Payments for debt issue costs (549) (980)
Net proceeds from the sale of Partnership units 114,530 289,908
Proceeds from stock options exercised   487
Proceeds from stock issued pursuant to our employee stock purchase plan 888 940
Purchases of treasury stock (1,842) (2,415)
Stock-based compensation excess tax benefit 208 816
Distributions to noncontrolling partners in the Partnership (27,017) (15,841)
Net cash provided by financing activities 107,114 71,066
Effect of exchange rate changes on cash and cash equivalents (476) (1,012)
Net decrease in cash and cash equivalents (524) (9,578)
Cash and cash equivalents at beginning of period 21,903 44,361
Cash and cash equivalents at end of period 21,379 34,783
Parent
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 2,324 (471)
Net cash provided by (used in) operating activities 2,324 (471)
Cash flows from investing activities:    
Return on investment in consolidated subsidiaries   87,419
Net cash used in continuing operations   87,419
Net cash used in investing activities   87,419
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 570,000 528,740
Repayments of long-term debt (541,650) (655,824)
Proceeds from stock options exercised   487
Proceeds from stock issued pursuant to our employee stock purchase plan 888 940
Purchases of treasury stock (1,842) (2,415)
Stock-based compensation excess tax benefit 208 816
Borrowings (repayments) between consolidated subsidiaries, net (29,744) 40,283
Net cash provided by financing activities (2,140) (86,973)
Net decrease in cash and cash equivalents 184 (25)
Cash and cash equivalents at beginning of period 93 160
Cash and cash equivalents at end of period 277 135
Guarantor Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations (11,787) (19,552)
Net cash provided by (used in) operating activities (11,787) (19,552)
Cash flows from investing activities:    
Capital expenditures (143,969) (56,592)
Contract operations acquisition 77,415 62,217
Proceeds from sale of property, plant and equipment 7,719 6,105
Capital distributions received from consolidated subsidiaries 15,043 16,392
Investment in consolidated subsidiaries (16,552) (20,645)
Net cash used in continuing operations (60,344) 7,477
Net cash used in investing activities (60,344) 7,477
Cash flows from financing activities:    
Net proceeds from the sale of Partnership units   162,236
Capital distribution to affiliates   (87,419)
Borrowings (repayments) between consolidated subsidiaries, net 69,909 (61,146)
Net cash provided by financing activities 69,909 13,671
Net decrease in cash and cash equivalents (2,222) 1,596
Cash and cash equivalents at beginning of period 2,810 1,586
Cash and cash equivalents at end of period 588 3,182
Other Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 62,067 13,155
Net cash provided by discontinued operations 1,123 1,990
Net cash provided by (used in) operating activities 63,190 15,145
Cash flows from investing activities:    
Capital expenditures (83,885) (47,710)
Contract operations acquisition (77,415) (62,217)
Proceeds from sale of property, plant and equipment 18,314 24,528
Increase in restricted cash (162) 184
Return of investments in non-consolidated affiliates 42,291  
Cash invested in non-consolidated affiliates (224)  
Return on investment in consolidated subsidiaries   87,419
Net cash used in continuing operations (101,081) 2,204
Net cash used in discontinued operations (973) (1,269)
Net cash used in investing activities (102,054) 935
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 609,000 474,669
Repayments of long-term debt (616,454) (549,434)
Payments for debt issue costs (549) (980)
Net proceeds from the sale of Partnership units 114,530 127,672
Distributions to noncontrolling partners in the Partnership (42,060) (32,233)
Net proceeds from sale of general partner units 2,426 1,316
Capital distribution to affiliates   (87,419)
Capital contributions received from parent 14,126 19,329
Borrowings (repayments) between consolidated subsidiaries, net (40,165) 20,863
Net cash provided by financing activities 40,854 (26,217)
Effect of exchange rate changes on cash and cash equivalents (476) (1,012)
Net decrease in cash and cash equivalents 1,514 (11,149)
Cash and cash equivalents at beginning of period 19,000 42,615
Cash and cash equivalents at end of period 20,514 31,466
Eliminations
    
Cash flows from investing activities:    
Capital distributions received from consolidated subsidiaries (15,043) (16,392)
Investment in consolidated subsidiaries 16,552 20,645
Return on investment in consolidated subsidiaries   (174,838)
Net cash used in continuing operations 1,509 (170,585)
Net cash used in investing activities 1,509 (170,585)
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 15,043 16,392
Net proceeds from sale of general partner units (2,426) (1,316)
Capital distribution to affiliates   174,838
Capital contributions received from parent (14,126) (19,329)
Net cash provided by financing activities $ (1,509) $ 170,585